[Spaceywilly]

Basically if you are in an extremely tight turn and lift a wheel, you won't get power until the wheel touches down again, similar to an open diff. As long as you have some traction on the wheel that is slipping it will transfer some percentage of the torque to the opposite wheel, meaning when you are powering out of a turn the power will shift to the outside wheel. You can "fake" it by pulling up the ebrake, not so much to lock up the wheels but enough to give some resitance for the diff to push against. A mechanical locking diff will actually sense differences between the shaft speeds and apply a certain amount of lock to try and equalize them, so it will still work if one wheel is lifted.